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        <title>太阳系行星数据</title>
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            <caption>太阳系中行星的一些数据。（资料取自<a href="http://nssdc.gsfc.nasa.gov/planetary/factsheet/">NASA 行星数据 - 公制</a>，
                图片取自<a href="https://www.nasa.gov/multimedia/imagegallery/">NASA 照片库</a>。）</caption>
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                <th colspan="2">&nbsp;</th>
                <th>名字</th>
                <th>图片</th>
                <th>质量(10<sup>24</sup>kg)</th>
                <th>直径(km)</th>
                <th>密度(kg/m<sup>3</sup>)</th>
                <th>重力(m/s<sup>2</sup>)</th>
                <th>天长(小时)</th>
                <th>与太阳距离(10<sup>6</sup>\km)</th>
                <th>平均温度(&#8451;)</th>
                <th>卫星数量</th>
                <th>备注</th>
            </tr>
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                <td colspan="2" rowspan="4">类地行星</td>
                <td>水星</td>
                <td style="text-align: center"><img src="source/planets/mercury.jpg" alt=""></td>
                <td>0.330</td>
                <td>4,879</td>
                <td>5427</td>
                <td>3.7</td>
                <td>4222.6</td>
                <td>57.9</td>
                <td>167</td>
                <td>0</td>
                <td>距太阳最近</td>
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                <td>金星</td>
                <td><img src="source/planets/venus.jpg" alt=""></td>
                <td>4.87</td>
                <td>12,104</td>
                <td>5243</td>
                <td>8.9</td>
                <td>2802.0</td>
                <td>108.2</td>
                <td>464</td>
                <td>0</td>
                <td></td>
            </tr>
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                <td>地球</td>
                <td><img src="source/planets/earth.png" alt=""></td>
                <td>5.97</td>
                <td>12,756</td>
                <td>5514</td>
                <td>9.8</td>
                <td>24.0</td>
                <td>149.6</td>
                <td>15</td>
                <td>1</td>
                <td>我们的世界</td>
            </tr>
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                <td>火星</td>
                <td><img src="source/planets/mars.jpg" alt=""></td>
                <td>0.642</td>
                <td>6,792</td>
                <td>3933</td>
                <td>3.7</td>
                <td>24.7</td>
                <td>227.9</td>
                <td>-65</td>
                <td>2</td>
                <td>红色星球</td>
            </tr>
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                <td rowspan="4">木行星</td>
                <td rowspan="2">气巨星</td>
                <td>木星</td>
                <td><img src="source/planets/jupiter.jpg" alt=""></td>
                <td>1898</td>
                <td>143,984</td>
                <td>1326</td>
                <td>23.1</td>
                <td>9.9</td>
                <td>778.6</td>
                <td>-110</td>
                <td>67</td>
                <td>太阳系最大</td>
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                <td>土星</td>
                <td><img src="source/planets/saturn.jpg" alt=""></td>
                <td>568</td>
                <td>120,536</td>
                <td>687</td>
                <td>9.0</td>
                <td>10.7</td>
                <td>1433.5</td>
                <td>-140</td>
                <td>62</td>
                <td></td>
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                <td rowspan="2">冰巨星</td>
                <td>天王星</td>
                <td><img src="source/planets/uranus.jpg" alt=""></td>
                <td>86.8</td>
                <td>51,118</td>
                <td>1271</td>
                <td>8.7</td>
                <td>17.2</td>
                <td>2872.5</td>
                <td>-195</td>
                <td>27</td>
                <td></td>
            </tr>
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                <td>海王星</td>
                <td><img src="source/planets/neptune.jpg" alt=""></td>
                <td>102</td>
                <td>49,528</td>
                <td>1638</td>
                <td>11.0</td>
                <td>16.1</td>
                <td>4495.1</td>
                <td>-200</td>
                <td>14</td>
                <td></td>
            </tr>
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                <td colspan="2">矮行星</td>
                <td>冥王星</td>
                <td><img src="source/planets/pluto.jpg" alt=""></td>
                <td>0.0146</td>
                <td>2,370</td>
                <td>2095</td>
                <td>0.7</td>
                <td>153.3</td>
                <td>5906.4</td>
                <td>-225</td>
                <td>5</td>
                <td>2005年降格，但<a href="http://www.usatoday.com/story/tech/2014/10/02/pluto-planet-solar-system/16578959/">尚存争议</a></td>
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